015 - Lattice Paths

Problem 15 / Challenge #15: Lattice Paths

Starting in the top left corner of a $2 \times 2$ grid, and only being able to move to the right and down, there are exactly $6$ routes to the bottom right corner.

How many such routes are there through a $20 \times 20$ grid?

ProjectEuler+ Problem Statement

The Project Euler problem is equivalent to the ProjectEuler+ challenge with $T = 1$, $N = 20$, $M = 20$, and MODULO = False.